Still for re-refining used crankcase oils



May 21, 1940.

.- w. D. HARRIS 2,201,558

' STILL FOR RE- RE FINING USED CRANKCASE OILS 0; iginal Fi1ed Feb. 6,1935 I 2 Sheets-Sheet yzp 2/ l I [I i I 1 ENTQR.

BY E g ATTORNEY.

May 21, 1940. w. D. HARRI S' I STILL FOR RE-REFINING USED CRANKCASE OILSOriginal Filed Feb. 6-, 1935 2 Sheets-Sheet 2 FIG. 2.

IIIHIIIIaNI i IILII IIIIIIIIF I FIG. 3.

' INVENTOR.

Qa- ATTORNEY.

Patented May 21, 1940 STILL FOR RE-REFINING USED CRANKC'ASE OILS WilliamD. Harris, Kansas City, Mo, assignor to Refinoil ManufacturingCorporation, Kansas City, Mo., a corporation of Missouri Originalapplication February 6, 1935, Serial No. 5,172. Divided and thisapplication December 26, 1935, Serial No. 56,139

1 Claim.

My invention relates particularly to my copending application, SerialNo. 5,172, filed February 6, 1935 of which this is a division. In thatcase apparatus is provided to practice a method of re-refining usedcrankcase oil by treating the oil with sulphuric acid, then heating theoil in a still from which the air has been exhausted in the vacuum thusproduced, the diluents and light ends are distilled ofi as more fullydescribed in United States Patents Nos. 1,707,672 and 1,820,871. I havefound in practice that the boiling of the oil in process of distillationproduces bubbles. These bubbles are a source of considerable annoyancefor they contain oil and dilution or light ends of oil. Unless they arebroken up, they carry oil, etc. over into the dilution tank and spoilthe by-product thus obtained. If they are broken down, the oil which wasin the bubbles, drops back into the still and only the vapor will reachthe dilution tank.

My invention has. for its principal object to provide a construction forthe still to be used in carrying out the process, described in thepatents above referred to, which will effectually break any bubbles,which may be formed in the still, before they are carried tothe'dilution tank.

My means of accomplishing the foregoing objects may be more readilyunderstood by having reference to the accompanying drawings which arehereunto annexed and are a part of this specification, in which-- Fig. 1is a side elevation of my improved still;

Fig. 2 is a vertical sectional view showing the interior construction ofthe element; and

Fig. 3 is an enlarged detailed View of the bailles. Similar referencenumerals refer to similar parts throughout the entire description.

As shown in the drawings, I have illustrated the still I, a condenser 2,a dilution tankB, a contact filter 4, with the suitable pipes connectingthe same. The still I is constructed with double walls It and H, theinner wall ll being made to withstand high pressures. It is spaced fromthe outer wall 16 by means of suitable angles I2. I provide a dome It atthe top of the still. This dome l3 has a heavy pipe !4 which is fittedto a flange !5 and is capped by a plate IS. A series of bafile platesformed by discs I! and rings 18 mounted in alternate layers on the pipeare arranged in the form of a cartridge. These plates are preferablycarried by the plate l6 and serve to eifectually break any bubbles:which may be carried up to the dome and towards the lead to the dilutiontank. They also serve a useful purpose in absorbing some of the heat inthe vapor as it passes to the dilution tank. These. various tanks may besupported in any manner desired. As shown they are supported by a frame20 which is provided with a platform 2! which supports the still I.Bands 22 are provided to hold the still firmly in place. The condenser 2is held by means of bands 23 to one end wall of the still I,

substantially as shown. The dilution tank 3 is preferably supported onbrackets 24. Bands 25 being provided to secure it to the brackets 24.The contact filter 4 is preferably supported on a platform 26 below thestill I. It will be apparout to persons skilled in the art that thesestructural details may be varied as desired to meet operatingconditions. Furthermore the specific details shown and described of thestill are not to be deemed limitations but merely as illustrative of apreferred embodiment of my invention.

Having described my invention, what I regard as new and desire to secureby Letters Patent is- In a still for heating oil, a dome at the top ofsaid still, a pipe in said dome, a flange on one

